JPH03255953A - Gap inspection device - Google Patents

Abstract

PURPOSE:To accurately inspect whether or not where is a gap part at an inspection place by detecting impulsive vibration applied to the inspection part by a hammer part and processing the signal of the impulsive vibration. CONSTITUTION:The inspection surface 7 is given the impulsive vibration by the hammer part 1 and the vibration is detected by a sensor part 2. The signal of the impulsive vibration detected by the sensor part 2 is processed by a decision part 3 to decide whether or not there is a gap in the inspection surface 7 and the decision result of the decision part 3 is displayed on a display part 4. For example, a grout material is charged between a new inserted pipe and an existent pipe and if there is a gap part in the grout charged part, the detection waveform of the sensor part 2 becomes a vibration waveform which is long in attenuation time. Consequently, the output of an integrator 14 becomes higher than that in absence of the gap part and the number of comparators which exceed a set value among comparators 15a - 15f increases and the number of LEDs which illuminate among LEDs 22a - 22f increases, so whether or not there is a gap part and its size can accurately be detected. Therefore, the inspection is enabled without any individual difference in decision result.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a void inspection device used for, for example, filling inspection of grout material and coating inspection of lining material.

[Conventional technology]

In the PIF method, which is one of the water pipe renewal construction methods, grout is filled into the gap between the inserted new pipe and the existing pipe, but if the grout filling is incomplete, the inserted new pipe and the existing pipe are Rainwater collects in the gap created between the pipe and the new pipe, causing problems such as accelerated corrosion of the inserted new pipe.

Therefore, in order to prevent such problems from occurring, a grout filling inspection is carried out.In the past, an inspector would tap the inner surface of the newly inserted pipe with a hammer, listen to the sound of the tapping, and then distinguish between the new pipe and the existing pipe. It was inspected to see if the grout was completely filled between the two.

[Problem to be solved by the invention]

However, since the above-mentioned inspection method relies on the subjective judgment of the inspector, there are individual differences in the judgment, and the presence or absence of voids cannot be accurately inspected.

The present invention has been made in view of the above circumstances, and its purpose is to enable inspections to be easily carried out by persons other than inspectors, without causing individual differences in judgment results, and to detect the presence or absence of voids. An object of the present invention is to provide a void inspection device that can accurately inspect the air gap.

[Means to solve the problem]

In order to solve the above problems, a void inspection device according to the present invention includes: a hammer section that applies impact vibration to the inspection location; a sensor section that detects the impact vibration applied to the inspection location by the hammer section; The apparatus is equipped with a determination section that performs signal processing on the detected impact vibration to determine whether or not there is a gap in the inspection area, and a display section that displays the determination result of the determination section.

[For production]

In the gap inspection device according to the present invention, the inspection location is hit with a hammer part, and the impact vibration is detected by the sensor part. Then, the impact vibration detected by the sensor section is signal-processed by the determination section to determine whether or not there is a gap in the inspection area, and the determination result of the determination section is displayed on the display section. Therefore, even a person other than the inspector can easily perform the inspection, and there is no individual difference in the determination result, and the presence or absence of a void can be accurately inspected.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 5.

FIG. 1 is a diagram showing the general configuration of a gap inspection device according to the present invention, and this gap inspection device includes a hammer section 1, a sensor section 2, a determination section 3, and a display section 4.

The hammer part 1 is used to apply impact vibration to the inspection area, for example, as shown in FIG. It is configured to apply impact vibration.

On the other hand, the sensor section 2 is moved to the inspection surface 7 by the hammer section 1.
For example, as shown in Fig. 3, a magnet 8 is pressed against the inspection surface 7, and a sensor 9 installed on the top of the magnet 8 detects the vibration waves. It is configured. Note that a cord 1o for transmitting the output of the sensor 9 to the determination section 3 is connected to the sensor section 2.

The determination unit 3 processes the signal (vibration wave) from the sensor unit 2 to determine whether there is a gap in the inspection area, and as shown in FIG.
2, waveform correction circuit 13, integrator 14, comparator 15
a~15f1 Vibration wave detection circuit 16, hold signal generation circuit 17, sampling signal generation circuit 18, latch circuit 1
9, a hold circuit 20 and a sensitivity adjustment circuit 21.

The amplifier 11 is for amplifying the output of the sensor section 2 to a predetermined level, and the output of the sensor section 2 amplified by the amplifier 11 is shaped into a vibration wave on only one side by a waveform shaping circuit 12, and further waveform correction is performed. After cutting unnecessary waveforms above a certain level in a circuit 13, the signal is supplied to an integrator 14.

The integrator 14 integrates the vibration wave from the sensor section 2 and converts the decay time of the vibration wave into a voltage signal, so the output of the integrator 14 is sent to the comparators 15a, 15b, 1.
5c, 15d, 15e.

15f.

The comparators 15a, 15b, 15c.

15d, 15e, and 15f are for comparing the output of the integrator 14 with a predetermined setting value to determine the presence or absence of a void, and each comparator 15a, 15b, 15c
, 15d, 15e.

The setting values of 15f have different setting levels.

Further, the output of the sensor section 2 amplified by the amplifier 11 is supplied to a vibration wave detection circuit 16.

This vibration wave detection circuit 16 is for triggering the hold signal generation circuit 17 and the sampling signal generation circuit 18, and is configured so that when the output of the sensor section 2 is inputted via the amplifier 11, the bird sends out a pulse. has been done.

The hold signal generation circuit 17 is for setting the vibration wave acquisition time (approximately 1 second) of the integrator 14, and sends a hold signal to the integrator 14 when a trigger pulse from the vibration wave detection circuit 16 is input. is configured to do so.

The sampling signal generation circuit 18 is for setting the integration time (approximately 40 μs) of the integrator 14, and sends a sampling signal to the integrator 14 when a trigger pulse from the vibration wave detection circuit 16 is input. It is configured.

The latch circuit 19 is a comparator 15a.

These are for outputting the outputs of 15b, 15c, 15d, 15e, and 15f to the display section 4, and the comparators 15a, 15b, and 15 are connected to each other by a hold signal from the hold circuit 20.
c, 15d, 15e.

It is configured to hold the output of 15f for a certain period of time (for example, 20 seconds). Note that the sensitivity adjustment circuit 21
is for adjusting the output of the integrator 14 according to the object to be inspected.

Further, the display section 4 includes a plurality of LEDs 22a.

22b, 22c, 22d, 22e, and 22f, and lights up according to the number of signals sent from the latch circuit 19.
The number of EDs is changed.

In the void inspection device configured in this way, the hammer part 1
Impact vibration is applied to the inspection surface 7, and this is detected by the sensor section 2. Then, the impact vibration detected by the sensor section 2 is subjected to signal processing in the determination section 3, it is determined whether or not there is a gap in the inspection surface 7, and the determination result of the determination section 3 is displayed on the display section 4.

Here, for example, if the grout material is filled without any gap between the inserted new pipe and the existing pipe, the detected waveform of the sensor section 2 will be a vibration waveform with a short decay time as shown in FIG. 4. On the other hand, if there is a void in the grout filled portion, the waveform detected by the sensor section 2 will be a vibration waveform with a long decay time, as shown in FIG.

As a result, when there is a void in the grout filling part, the output of the integrator 14 becomes higher than when there is no void (A
>B) Since the number of LEDs 22a to 22f that are lit increases, the presence or absence of a gap and its size can be accurately detected.

In this way, in the above embodiment, the sensor section 2 detects the impact vibration applied to the inspection surface 7 by the hammer section 1, and the determination section 3 processes the output signal of the sensor section 2 to determine the inspection surface 7.
Since it determines whether or not there is a void in the area, it can be easily inspected by anyone other than the inspector, and there are no individual differences in the determination results, making it possible to accurately inspect the presence or absence of a void. can. Furthermore, in the above embodiment, since the vibration wave acquisition time of the integrator 14 is set by the hold signal from the hold signal generation circuit 17, other signals are not manually input to the integrator 14 during the inspection. The presence or absence of voids can be inspected with high precision.

The hammer section 1, the sensor section 2, the determination section 3, and the display section 4 are not limited to the embodiments described above, and various modifications can be made without departing from the gist of the present invention. Furthermore, the present invention can be applied not only to the filling inspection of grout materials, but also to, for example, the coating inspection of coating materials.

〔Effect of the invention〕

As explained above, the void inspection device according to the present invention includes a hammer section that applies impact vibration to the inspection location, a sensor section that detects the impact vibration applied to the inspection location by the hammer section, and a sensor section that detects the impact vibration applied to the inspection location by the hammer section. The apparatus is equipped with a determination section that processes the impact vibrations caused by signal processing to determine whether or not there is a gap in the inspection area, and a display section that displays the determination result of the determination section.

Therefore, even a person other than the inspector can easily perform the inspection, and there is no individual difference in the determination result, and the presence or absence of a void can be accurately inspected.

[Brief explanation of drawings]

1 to 5 show an embodiment of the present invention, in which FIG. 1 is a schematic diagram of a gap inspection device, FIG. 2 is a diagram of a hammer section, FIG. 3 is a diagram of a sensor section, and FIG. 4 and 5 are diagrams for explaining the operation of the same embodiment. DESCRIPTION OF SYMBOLS 1... Hammer part, 2... Sensor part, 3... Judgment part, 4... Display part, 11... Amplifier, 12...
Waveform shaping circuit, 13... Waveform modification circuit, 14... Integrator, 15a-15f... Comparator, 16...
Vibration wave detection circuit, 17... Hold signal generation circuit, 1
8... Sampling signal generation circuit, 1... Latch circuit, 20... Hold circuit, 2 1... Sensitivity adjustment circuit, 22a to 22... LED.

Claims (1)

[Claims] A hammer section that applies impact vibration to the inspection location, a sensor section that detects the impact vibration applied to the inspection location by this hammer section, and a signal processing of the impact vibration detected by this sensor section to detect a gap in the inspection location. What is claimed is: 1. A void inspection device comprising: a determination section that determines whether or not the above conditions are met; and a display section that displays the determination result of the determination section.